MICROANATOMY

Detailed explanation-1: -Cellular differentiation is often controlled by cell signaling. Many of the signal molecules that convey information from cell to cell during the control of cellular differentiation are called growth factors.

Detailed explanation-2: -DNA is so important to cell differentiation because it has the instructions for all different types of specialization. Cell differentiation occurs due to differential gene expression, where some genes are turned on and others are turned off. Genes are coded for in the sequence of nucleotides present in the DNA.

Detailed explanation-3: -Terminally differentiated cells do not replicate their genomic DNA, and could therefore dispense with the task of removing DNA damage from the non-essential bulk of their genome, as long as they are able to maintain the integrity of the genes that must be expressed.

Detailed explanation-4: -Cell differentiation is the process by which dividing cells change their functional or phenotypical type. All cells presumably derive from stem cells and obtain their functions as they mature. Cellular composition is often modeled as a hierarchical scheme with stem cells at the top of the hierarchy.